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#1 2025-02-27 13:32:31
- 256
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- Registered: 2023-12-17
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[SOLVED] Overscan on multi-monitor setup
I recently added a 1080p screen to my PC over a HDMI port, in addition to a 1920x1200 screen over DVI that I was already using before. The 1920x1200 screen still works fine, but the 1080p one is overscanned (zoomed in so you can't see the edges, and what you can see is blurry due to resizing). This monitor has worked fine in the past, including on GNU/Linux installs on this same machine if memory serves.
Output of xrandr --prop (EDIDs snipped out):
Screen 0: minimum 320 x 200, current 3840 x 1200, maximum 8192 x 8192
VGA-1 disconnected primary (normal left inverted right x axis y axis)
scaling mode: None
supported: None, Full, Center, Full aspect
load detection: 1
range: (0, 1)
link-status: Good
supported: Good, Bad
CONNECTOR_ID: 47
supported: 47
non-desktop: 0
range: (0, 1)
HDMI-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 480mm x 270mm
audio: auto
supported: off, on, auto
scaling mode: None
supported: None, Full, Center, Full aspect
dither: off
supported: off, on
underscan vborder: 27
range: (0, 128)
underscan hborder: 48
range: (0, 128)
underscan: off
supported: off, on, auto
coherent: 1
range: (0, 1)
link-status: Good
supported: Good, Bad
CONNECTOR_ID: 49
supported: 49
non-desktop: 0
range: (0, 1)
1920x1080 60.00*+ 59.96 50.00 59.94 59.93
1920x1200 59.95
1920x1080i 60.00 50.00 59.94
1600x1200 65.00 60.00
1680x1050 59.95 59.88
1400x1050 74.76 59.98 59.95
1600x900 59.94 59.95 59.82
1280x1024 75.02 60.02
1440x900 59.90
1400x900 59.96 59.88
1280x960 60.00
1440x810 59.97
1368x768 59.88 59.85
1280x800 59.99 59.97 59.81 59.91
1152x864 75.00
1280x720 60.00 59.99 59.86 60.00 50.00 59.94 59.74
1440x576 50.00
1024x768 75.05 60.04 75.03 70.07 60.00
960x720 75.00 60.00
1440x480 60.00 59.94
928x696 75.00 60.05
896x672 75.05 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
832x624 74.55
960x540 59.96 59.99 59.63 59.82
800x600 75.00 70.00 65.00 60.00 72.19 75.00 60.32 56.25
840x525 60.01 59.88
864x486 59.92 59.57
720x576 50.00
720x576i 50.00
700x525 74.76 59.98
800x450 59.95 59.82
720x480 60.00 59.94
720x480i 60.00 59.94
640x512 75.02 60.02
700x450 59.96 59.88
640x480 60.00 75.00 72.81 75.00 66.67 60.00 59.94
720x405 59.51 58.99
720x400 70.08
684x384 59.88 59.85
640x400 59.88 59.98
576x432 75.00
640x360 59.86 59.83 59.84 59.32
512x384 75.03 70.07 60.00
512x288 60.00 59.92
416x312 74.66
480x270 59.63 59.82
400x300 72.19 75.12 60.32 56.34
432x243 59.92 59.57
320x240 72.81 75.00 60.05
360x202 59.51 59.13
320x180 59.84 59.32
DVI-I-1 connected 1920x1200+1920+0 (normal left inverted right x axis y axis) 518mm x 324mm
load detection: 1
range: (0, 1)
audio: auto
supported: off, on, auto
scaling mode: None
supported: None, Full, Center, Full aspect
dither: off
supported: off, on
underscan vborder: 0
range: (0, 128)
underscan hborder: 0
range: (0, 128)
underscan: off
supported: off, on, auto
coherent: 1
range: (0, 1)
link-status: Good
supported: Good, Bad
CONNECTOR_ID: 51
supported: 51
non-desktop: 0
range: (0, 1)
1920x1200 59.95*+
1920x1080 59.96 60.00 59.93
1600x1200 65.00 60.00
1680x1050 59.95 59.88
1400x1050 59.98
1600x900 59.95 59.82
1280x1024 60.02
1400x900 59.96 59.88
1280x960 60.00
1440x810 59.97
1368x768 59.88 59.85
1280x800 59.99 59.97 59.81 59.91
1280x720 60.00 59.99 59.86 59.74
1024x768 60.04 70.07 60.00
960x720 60.00
928x696 60.05
896x672 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
960x540 59.96 59.99 59.63 59.82
800x600 70.00 65.00 60.00 60.32 56.25
840x525 60.01 59.88
864x486 59.92 59.57
700x525 59.98
800x450 59.95 59.82
640x512 60.02
700x450 59.96 59.88
640x480 60.00 59.94
720x405 59.51 58.99
720x400 70.08
684x384 59.88 59.85
640x400 59.88 59.98
640x360 59.86 59.83 59.84 59.32
512x384 70.07 60.00
512x288 60.00 59.92
480x270 59.63 59.82
400x300 60.32 56.34
432x243 59.92 59.57
320x240 60.05
360x202 59.51 59.13
320x180 59.84 59.32 Using "xrandr --output HDMI-1 --set underscan on" and doing the necessary hborder/vborder setting technically fixed the overscan, but everything was still blurry, like when you resize an image and then resize it back to its original size. Twiddling with the monitor's own settings menu with the buttons on the side didn't reveal anything useful. Some of the threads I found about this had to with TVs being used as monitors, but that's not an issue here.
Here's my GPU (from sudo lspci -vv):
02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV620 LE [Radeon HD 3450] (prog-if 00 [VGA controller])
Subsystem: Dell Device 9018
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 27
NUMA node: 0
Region 0: Memory at d0000000 (64-bit, prefetchable) [size=256M]
Region 2: Memory at fdff0000 (64-bit, non-prefetchable) [size=64K]
Region 4: I/O ports at e000 [size=256]
Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: [50] Power Management version 3
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [58] Express (v2) Legacy Endpoint, IntMsgNum 0
DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <4us, L1 unlimited
ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset- TEE-IO-
DevCtl: CorrErr- NonFatalErr- FatalErr- UnsupReq-
RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop+
MaxPayload 128 bytes, MaxReadReq 128 bytes
DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr- TransPend-
LnkCap: Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Exit Latency L0s <64ns, L1 <1us
ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp-
LnkCtl: ASPM Disabled; RCB 64 bytes, LnkDisable- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x16
TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
DevCap2: Completion Timeout: Not Supported, TimeoutDis- NROPrPrP- LTR-
10BitTagComp- 10BitTagReq- OBFF Not Supported, ExtFmt- EETLPPrefix-
EmergencyPowerReduction Not Supported, EmergencyPowerReductionInit-
FRS-
AtomicOpsCap: 32bit- 64bit- 128bitCAS-
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-
AtomicOpsCtl: ReqEn-
IDOReq- IDOCompl- LTR- EmergencyPowerReductionReq-
10BitTagReq- OBFF Disabled, EETLPPrefixBlk-
LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
Compliance Preset/De-emphasis: -6dB de-emphasis, 0dB preshoot
LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete- EqualizationPhase1-
EqualizationPhase2- EqualizationPhase3- LinkEqualizationRequest-
Retimer- 2Retimers- CrosslinkRes: unsupported
Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Address: 00000000fee01000 Data: 0026
Capabilities: [100 v1] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
Kernel driver in use: radeon
Kernel modules: radeon, amdgpuThe last thing I can think of is xrandr's --transform option, but wouldn't that have the same problem with blurring as underscan?
I'm using i3, if it matters.
Last edited by 256 (2025-02-27 16:32:53)
"Don't comment bad code - rewrite it." - The Elements of Programming Style (1978), Brian W. Kernighan & P. J. Plauger, p. 144.
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#2 2025-02-27 16:13:19
- seth
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- From: Won't reply 2 private help req
- Registered: 2012-09-03
- Posts: 75,086
Re: [SOLVED] Overscan on multi-monitor setup
technically fixed the overscan, but everything was still blurry
Yes, you have to fix that in the monitor (tv?) by disabling the overscan there.
Compensating by underscanning the source is a kludge to at least get you the full image on display, but it will never be a good solution.
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#3 2025-02-27 16:32:29
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- Registered: 2023-12-17
- Posts: 78
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Re: [SOLVED] Overscan on multi-monitor setup
Yes, you have to fix that in the monitor (tv?) by disabling the overscan there.
Compensating by underscanning the source is a kludge to at least get you the full image on display, but it will never be a good solution.
Oh! I gave up on the monitor's settings because the most promising looking options were greyed out. The relevant setting was actually under "input select", which I disregarded earlier as being unimportant. I set it to "HDMI PC" from "HDMI AV" (what does AV stand for?). Now it works.
"Don't comment bad code - rewrite it." - The Elements of Programming Style (1978), Brian W. Kernighan & P. J. Plauger, p. 144.
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